Eventually they tell me that I have a “Contemplating Poop” face and that they always know if I’m considering taking a dump.
People don't know that this is what a healthy mature loving relationship looks like. This is the endgame where your chosen life mate knows you so well that in some ways they know you better than yourself. This is likely just one example of subtle hints they know of to judge your mood and your needs. Later it just seems like magic when your partner puts a meal down in front of you, and you just realized you're so thankful because you're famished. If you're doing a loving relationship right, you do this for them too in ways they can't understand.